@article{yu2020counterfactual,
  title={Counterfactual Variable Control for Robust and Interpretable Question Answering},
  author={Yu, Sicheng and Niu, Yulei and Wang, Shuohang and Jiang, Jing and Sun, Qianru},
  journal={arXiv preprint arXiv:2010.05581},
  year={2020}
}